Today | Weather | Thursday, July 23, 2026

Weather in Redwood City, California

04:43 AM
Now
Foggy Weather
61° F
Feels Like 57°
Precipitation 0 %
Wind 7 mph
Humidity 87 %
Today
Cloudy Weather
Day 75°
Night 57°
Precipitation 1 %
Wind 10 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Redwood City Weather Forecast Updated

29 minutes ago
Last updated on

Air Quality in Redwood City

NOW
38 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.06 µg/m³
PM10 9.08 µg/m³
O3 0.041 ppm
NO2 0.4 ppb
SO2 0.3 ppb
CO 0.07 ppm
NH3 0 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.53.06 µg/m³
PM109.08 µg/m³
O379.71 µg/m³
NO20.84 µg/m³
SO20.83 µg/m³
CO83.73 µg/m³
NH30 µg/m³
NO0 µg/m³